Expansion shell



Patented Mar. Z7, 1923.

JOHN H. PHiLL-irs, or-c:HIo`iicro,.,InLINoIsA IExrueirsiolv SHELL.,

Original application led July 14., 1919, Serial No. 312,242.- Dvidedandthis application filed March 31,`

' 192i.` semaine. 457,255.`

cago, in the county of Cook and State of lli nois, have invented certainnew and useful Improvements in Expansion Shells (Case as a'drill'partand the'other'part' not adrill- B), of which the followingis adescription. This application is a divisional case of my application,Serial No. 312,242, tiled July 14, 19,19, patented May 24, 1921,Number-v i'aeio. y

Y My invention belongs to that general class of devices known asexpansion shells, andrelates particularly to a multi-part shell whichvmaybe employed to drill two or more holes in concrete, brick, stone orlike material, and then be separated and have each ot its shell partsused with other parts, not drillparts and of cheaper constructiomtotasten andI hold various devices and mechanisms togsaid material.

Among the many uses to whichAV expansion lshells are put may bementioned the tasten-A ing of pipe and wire systems'andelectricalmechanisms and other equipment', etc., to

walls, ceilings, and floors ot concrete,`brick, stone or like material.

My invention has among its objects the production of'a'n 'expansionshell of the kind described, that lis simple, convenient, 'eicient,reliable, durable, inexpensive and suitable Jfor use wherever foundapplicable. It has particularly among its urther'objects to provide ashell made in two parts, and ot,r

which one of said parts may bee-constructedp'art, and of-suchconstruction-thatthevdrill 'part of one shell will pair withthe 'drillpartot another shell to form a complete tubular.y

drill, retaining the featuresessential toimost rapid and economicaldrilling of two or more holes, rafter which the drill parts are pairedwith shell parts, not drill parts, andused.

as fastenings in the holes so drilled. An-

other object of this constructionl is that the.

non-drill partfofcast metal or formed trom. sheetsteel, insuresaneconomical production ofexpansion shells ot `different design most`.suitable for fasteningito diiierent materials.k and the most economicaldrilling of the holes .in 'which they are permanently inserted.

p segment and the segment', notv ,a .drill v,segd

ment, which willl prevent'any longitudinal displacement between saidparts.

Another object of my inventionis in some desired Vcases'.toprovideanabutment on one of. the vshell parts which is adapted to be y bev'obvious't'othose skilled inthe ar't'trom theI ydisclosure hereingiven.

novel construction,'arrangement and combinati'ono't parts' herein shownand described, more particularly pointed out in the claims.

"In the drawings, wherein like reference characters indicate like orcorresponding parts;

Fig". l is asectionalv view takenthrougli my, improvedshell, showing`the `expander in v.placer Y Fig. 2 isa sectional Fig. il, .withthe'eXpander removed,"

Fig'. 3 is a sectionalviewsi'milar toFig. 2, showing the sections or;parts separated;

Fig; 4 .is a sectional view takenon thevline i-.totF-ig. l.; andv '1 lFig. 5 fend vrview yotlthe 'separated parts `shown/in fFigfB.

'Y ,In the-emboCliment':oit myrinvention, yas illustratedy in thedrawings, there is repreen sented tubular s'hell of the desiredv numberof `segmental parts, two `beingushown, said parts l-f'and 2.beingarranged circumferentially to torm thecompleteshel-l, fone of saidparts, 1y vfornexample, being ,preferably ar.- ranged with-cutting teethtat one 'end thereof. .The parts are madeof'Isuitablemmaterial andaofthe desired size,p'art -2vbeinlgr preterablyinade ot muchcheaper met-aland in a cheapergashionthanpart l. This, however,

.is not essential, @The untoothed end of part l is.pr'eferablyv tapered,as at 6, soy as'to be engagedpby l.af-suitable chuck, not shown.llhenjormingfthe hole in the material 3, in

v,which the partsaretobeinserted, a pair ofl tubular drill lparts,,eachfashioned .likefthe Y segment l, `are V.engaged in. asuitable chuck Afurther obj ect of my invention is to pro.-y vide an interlockingmeansbetweenthe drillY tars machin-.parte j To 'thise'nd my inventionconsists in the.

View taken similar to 'mechanism ,which either reciprooates oriv ro- Thematerial of the drill is preferably so selected that it will drill twoor more holes before it is too chilled for further drilling use, andthen each drill segment is combined with a cooperating segment 2, not adrill part, and of a cheaper material and structure, and inserted intothe hole and expanded therein.

The member 2 has its lower end constructed, as at 6, so as to correspondwith the chuck end of the part 1, in case the shell need at any time beengaged as an entirety by a chuck or the like.

The other end of the member 2 opposite its tapered end is offset toprovide an end wall or abutment 9, which preferably fits within the opentoothed end of the part 1, to substantially close said shell whenassembled. Where two cast parts are employed, reduced size extendingparts similar to 9 may be placed on the two p arts if desired.

Corrugations 8, or any other suitable manner of roughening, may beprovided in the exterior of at least one of the parts, as for instancepart 2, said corrugations being adapted to bite into and grip the wallof the hole in which the shell is inserted and expanded.

The bore of the shell plug is substantially circular except near theinnermost or closed end 9. There the bore is inclined or conicallytapered so that the bounding wall of the bore as it approaches thelaterally projecting end wall 9 is of a larger cross section than it isinwardly thereof. As shown, the segment 1 is bored or channeled with acircular arc entirely throughl its length, while the enlarged orchanneled portion 10 of the part 2 may be of any desired contour, as forinstance, partly elliptical and tapered.

yAdapted to be positioned within the bore is a cam-shaped member or nut11, said nut being bored and threaded and eccentrically mounted on abolt 12 having screw threads 13 thereon, said nut being of such a shapethat a portion of its peripheral wall is circular, as at 14, so as toengage the circular .bore of the part 1, and the remainder of itsperipheral wall is conically tapered, as at 15, and of the same degreeof taper and curvature as the inclined tapered channel 10 of the part 2,so that the nut will be non-rotatable within the shell or plug but maybe slid lonlgitudinally thereof so as to expand the parts. The bolt andnut are placed into the bore before the shell parts are put into thehole, and when inserted into the hole the bolt end will abut the endwall 9 of the part 2, and when screwed through nut 11 will cause thesame to slide. longitudinally to open or expand the shell parts intocontact with the peripheral wall of the hole, safely holding the shellin place while permanent load is applied to the rod or bolt 12.

The corrugations 8 will bitev into the material in which the hole ismade and tend to prevent any movement of the parts outwardly of thehole. The application of the permanent load or pull to the bolt willhave a further shell spreading action, thus firmly locking the parts inplace in the hole.

I have not considered it necessary to illustrate the chuck by means ofwhich the device is drilled, said chuck being described in myco-.pending application, Serial No. 361,906, filed February 7, 1920,patented May 24, 1921, Number 1,379,209. It will be noted that theexpansion shell and parts herein shown is especially applicable forfastening various devices to concrete ceilings and the like, requiringthe use of round hangers or bolt connections, etc.

After the holes have been drilled to the desired depth, the chuck anddrill shell removed, the drill parts are separated and each part 1 ismated with a cast shell part 2, and the tapered expander mechanism andbolt are then inserted in the bore of the shell and reinserted into thedrilled hole. The expander is then operated to expand the shell parts,causing` the same to be firmly and securely locked in place in the hole.To all intents and purposes, the same becomes substantially apermanent,l part of the wall, ceiling or the like, to which the variousdevices or other equipment may be secured by means of bars.'rods,hangers, pins, bolts, nuts or the equivalent.

Having thus described my invention, it is obvious that variousimmaterial modifican tions may be made in the same without departingfrom the spirit of my invention; hence I do not wish to be understood aslimitinp myself to the exact form, arrangement, construction andcombination of parts herein shown and described, or uses mentioned.

W hat I claim as new anddesire to secure by Letters Patent isz' 1. In anexpansion shell of the kind described and in combination, a tubular plugarranged for expansion at one end, the bore of said plug at itsexpansible end having a portion of its surface bounded by a circular arcand the remainder bounded by another arc, said latter portion beingtapered longitudinally of the bore, a nut arranged within said plug andhaving a portion of its peripheral surface bounded by a circular arcwhich extends circumferentially for and less than the full peripherythereof, and by another arc completing said periphery, said latterportion being tapered longitudinally of the bore, whereby said nut andbore may have their similar surfaces in contact, and means for slidingsaid nut longitudinally of said bore.

2. In an expansion shell of the kind described and in combination, atubularV plug arranged for expansion at one end, the bore of said plufrhaving a portion of its wall eccentric re ative to the axis and taperedlongitudinally thereof, a threaded bolt 1nsertable within said bore, anut eccentrieally mounted on said bolt within said bore so that theeccentric nut wall engages the eccentric peripheral wall of said bore toexpand said plug.

3. An expansion shell of the kind described, comprising a pair of.circumferentially mating parts, one of said parts having a recess inits longitudinal edge and having cutting teeth at one end, the other ofsaid parts having a projection on its longitudinal edge adapted to entersaid recess and preventing relative movement therebetween;

4. An expansion shell o-i the kind described, comprising a pair ofcircumferentially mating parts, one of said parts having cutting teethat one end, the other of said parts having a lateral wall at one endadapted to bridge the assembled shell at the toothed end, one of saidparts having a recess in its longitudinal mating edge and the other ofsaid parts having lateral projections on its longitudinal edge adaptedto enter said recess and prevent relative movement therebetween.

5. An expansion shell of the kind described, comprising a pair ofsegmental parts one of which has cutting teeth and the other of whichhas no cutting teeth thereat, and means for expanding said shell.

6. An expansion shell comprising a pair 0f circumferentially arrangedparts, one of which is a segmental part of a hollow drill and hascutting teeth thereon, and the other ,of which is a segmental part not adrill part and having no cutting teeth thereon, both of said parts beingformed at one end to engage a chuck, and means for expanding said shell.

7. An expansion shell of the kind described comprisingatubular plugformed of a plurality of circumferentially mating members arranged forexpansion at one end and having a laterally projecting end wall carriedby only one of said members substantially closing one end of said bore,a liar insertable in said bore from its other end and adapted to abutsaid end wall, and means within said bore means cooperable with said barto expand said plug.

8. An expansion shell of the kind described, comprising a pair ofcircumferentially mating parts, one of-said parts being open at bothends, and having no laterally extending wall at said ends, the other ofsaid parts having a lateral Wall at one end adapted to enter the openend of the cooperating segment and substantially close said end of theshell when assembled.

9. An expansion shell of the kind described, comprising a pair ofcircumferentially mating parts, one of said parts having cutting teethat one end, the other of said parts having a lateral wall at one endadapted to bridge the assembled shell at the toothed end.

In testimony whereof, -I have hereunto signed my name in the presence oftwo subscribing witnesses.

' JO'HN H. PHILLIPS. Witnesses:

Roxr W. HILL, BERTHA HARTMANN.

